NCY GY6 Up-Gear Kit 15*38 | Increase Top Speed

Unlock more top speed and a more usable rev range from your GY6 engine with the NCY 15?38 Up-Gear Kit. This gear set delivers an 18% increase in final drive ratio over the stock 13?40 setup — the ideal companion for a big bore kit or any build chasing higher top-end performance. ISO 9001 certified and made in Taiwan by NCY since 1997.

Installation Note: You must reuse the stock 42-tooth counter shaft gear. A 50-ton gear press is required for installation.

Specifications

• Front Counter Shaft: 15 teeth | Spline L: 24mm | OD: 31.1mm | Overall L: 60mm
• Gear Press-On Area: L: 12.08mm × OD: 19.08mm | Ends L: 9–10.5mm × OD: 15mm
• Rear Final Drive Gear: 38 teeth | Inner Spline: 19
• Rear Gear Dimensions: OD: 71.2mm | ID: 18mm | W: 20mm
• Ratio Increase: 18% over stock 13?40
• Origin: Made in Taiwan by NCY (ISO 9001)

Compatibility

Fits 157QMJ-based 125cc, 150cc, and 169cc engines with the following engine codes:

Performance Note: This product is intended for off-road use only and is not intended for use on public roads. Not legal for use in California on pollution-controlled vehicles — check local laws before installing.

California Prop 65 Warning: www.p65warnings.ca.gov

• 18% final drive ratio increase over stock 13*38 gear set
• Increases top speed and widens usable rev range
• Ideal companion for big bore kit builds
• ISO 9001 certified — Made in Taiwan by NCY since 1997
• Requires reuse of stock 42-tooth counter shaft gear

Front Counter Shaft: 15T | Spline L: 24mm | OD: 31.1mm | Overall L: 60mm | Rear Final Drive: 38T | Inner Spline: 19 | OD: 71.2mm | ID: 18mm | W: 20mm | Ratio Increase: 18% over stock 13*40 | Origin: Taiwan

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